Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Changes in Stockholders' Equity [Abstract]
ERB acquisition, shares		1,368,527
Restricted stock compensation expense, shares	13,839	26,952
Exercise of stock options, shares	14,748	5,824
Cash dividends- common stock per share	$ 0.28	$ 0.28
Sale of treasury shares to 401(k), shares	10,928	9,762
Sale of treasury shares to deferred compensation plan, shares	5,824	5,873